package com.wugui.datax.admin.core.route.strategy;

import java.util.List;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import com.wugui.datatx.core.biz.model.ReturnT;
import com.wugui.datatx.core.biz.model.TriggerParam;
import com.wugui.datax.admin.core.route.ExecutorRouter;

/**
 * Created by xuxueli on 17/3/10.
 */
public class ExecutorRouteRound extends ExecutorRouter {

	private static ConcurrentMap<Integer, Integer> routeCountEachJob = new ConcurrentHashMap<Integer, Integer>();
	private static long CACHE_VALID_TIME = 0;

	private static int count(int jobId) {
		// cache clear
		if (System.currentTimeMillis() > CACHE_VALID_TIME) {
			routeCountEachJob.clear();
			CACHE_VALID_TIME = System.currentTimeMillis() + 1000 * 60 * 60 * 24;
		}

		// count++
		Integer count = routeCountEachJob.get(jobId);
		count = (count == null || count > 1000000) ? (new Random().nextInt(100)) : ++count; // 初始化时主动Random一次，缓解首次压力
		routeCountEachJob.put(jobId, count);
		return count;
	}

	@Override
	public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
		String address = addressList.get(count(triggerParam.getJobId()) % addressList.size());
		return new ReturnT<String>(address);
	}

}
